shell:$ nslookup -timeout=2 -retry=1 'p47-caldav.icloud.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
p47-caldav.icloud.com	canonical name = caldav.fe2.apple-dns.net.
Name:	caldav.fe2.apple-dns.net
Address: 17.248.195.74
Name:	caldav.fe2.apple-dns.net
Address: 17.248.195.56
Name:	caldav.fe2.apple-dns.net
Address: 17.248.195.65
Name:	caldav.fe2.apple-dns.net
Address: 17.248.195.48
Name:	caldav.fe2.apple-dns.net
Address: 17.248.195.75
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::35
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::3d
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::1d
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::25
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::2:9
Name:	caldav.fe2.apple-dns.net
Address: 2620:149:a42:280::2:1